preparing for their first debate. >> president obama and mitt romney are off theampaign trail today as they get ready to face off tomorrow night. it's tuesday, october 2nd. >> announcer: from abc news, this is "world news now." >>> good tuesday morning, everyone. i'm paula faris. good to see you back. >> good to be back. >> uh-huh. >> you had fun in baltimore. back together. you had good time in baltimore. i had a good time in new orleans and now we are back at the desk. >> i was feeling it yesterday. you are feeling it today. >> running on fumes. that is for sure. i like the glasses -- something different. >> took him about 20 minutes. and then he was like something is different. >> i'm tired. >> glasses. my eyes are -- just -- significantly regressing. >> it happens in your 60s. good morning, everybody, i'm rob nelson. in a moment, a look at how each candidate will try to score points at the big debate tomorrow night. >>> also this half-hour, an amtrak train with 169 passengers collides with a big rig and then derails and passengers and eyewitnesses are describing the chaos that foll